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Nanomaterials 2018, 8(2), 103; https://doi.org/10.3390/nano8020103

Electrochemical Preparation of Polyaniline Nanowires with the Used Electrolyte Solution Treated with the Extraction Process and Their Electrochemical Performance

1,2,3,4
,
1,2,3,4,* , 1,2,3,4
,
1,2,3,4
,
1,2,3,4
and
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1
Clean Energy Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300354, China
2
Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300354, China
3
State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300354, China
4
Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300354, China
*
Author to whom correspondence should be addressed.
Received: 27 December 2017 / Revised: 1 February 2018 / Accepted: 7 February 2018 / Published: 12 February 2018
(This article belongs to the Special Issue Synthesis and Characterization of Nanowires)
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Abstract

Electrochemical polymerization of aniline is one of the most promising methods to prepare polyaniline (PANI) materials. However, during this process, the electrolyte solution must be replaced after electropolymerization of a certain time because of the generation and the accumulation of the by-products, which have significant effects on the morphology, purity and properties of PANI products. Treatment and recycling of the used electrolyte solution are worthwhile to study to reduce the high treatment cost of the used electrolyte solution containing aniline and its polymerization by-products. Here, the composition of the used electrolyte solution was separated and determined by high performance liquid chromatography coupled with diode array detection (HPLC-DAD) in the range of ultraviolet and visible (UV-Vis) light. The analysis results revealed that the used electrolyte solution consisted of aniline, p-hydroquinone (HQ), p-benzoquinone (BQ), co-oligomers of aniline and p-benzoquinone (CAB) and acid. Then, n-octanol and 2-octanone were selected as extracts to remove HQ, BQ and CAB from the used electrolyte solution. Following that, the recycled electrolyte solution was prepared by adjusting the concentration of aniline and acid of the aqueous phase, and the electrochemical polymerization process was conducted. Finally, the obtained PANI was characterized by scanning electron microscope (SEM) and electrochemical methods. The experimental results clearly demonstrate that the morphology and specific capacitance of PANI produced from the recycled electrolyte solution can be recovered completely. This research paves the way for reusing the used electrolyte solution for aniline electrochemical polymerization. View Full-Text
Keywords: polyaniline nanowires; electrochemical polymerization; p-benzoquinone; supercapacitor; extraction polyaniline nanowires; electrochemical polymerization; p-benzoquinone; supercapacitor; extraction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Wu, Y.; Wang, J.; Ou, B.; Zhao, S.; Wang, Z.; Wang, S. Electrochemical Preparation of Polyaniline Nanowires with the Used Electrolyte Solution Treated with the Extraction Process and Their Electrochemical Performance. Nanomaterials 2018, 8, 103.

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